JPH11166519A - Drill screw - Google Patents
Drill screwInfo
- Publication number
- JPH11166519A JPH11166519A JP33154197A JP33154197A JPH11166519A JP H11166519 A JPH11166519 A JP H11166519A JP 33154197 A JP33154197 A JP 33154197A JP 33154197 A JP33154197 A JP 33154197A JP H11166519 A JPH11166519 A JP H11166519A
- Authority
- JP
- Japan
- Prior art keywords
- thread
- drill
- chips
- screw
- screw thread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Drilling Tools (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、被締結材に対して
軸部先端のドリル部により自ら下穴を穿設すると共にこ
の下穴に対して後続するねじ部により自らねじ立てを行
うドリルねじに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill screw for drilling a prepared hole in a material to be fastened by a drill portion at the tip of a shaft portion and for tapping the prepared hole by a subsequent screw portion. It is about.
【0002】[0002]
【従来の技術】ドリルねじの軸部には、被締結材に切り
込んで下穴を穿設する切削刃、並びにこの切削刃による
切削で発生した切り屑を頭部側に送り出す逃げ溝を備え
たドリル部と、下穴に対してねじ立てを行うねじ山が形
成されたねじ部とが設けられており、これら切削刃、逃
げ溝並びにねじ山を被締結材の材質に応じて適切な形状
に設定した専用のドリルねじが種々提案・実用化されて
いる。2. Description of the Related Art A shaft portion of a drill screw is provided with a cutting blade which cuts a material to be fastened to form a pilot hole, and a relief groove for sending out chips generated by the cutting blade to the head side. A drill part and a thread part with a thread for tapping the pilot hole are provided, and these cutting blades, relief grooves and threads are formed into an appropriate shape according to the material of the workpiece Various dedicated drill screws have been proposed and put into practical use.
【0003】[0003]
【発明が解決しようとする課題】ところが、木材や吸音
材と鋼板とを締結する場合のように締結すべき複数の部
材の材質、特に硬さや靱性が相互に大きく異なると、従
来のドリルねじではうまく対応することができない。例
えば、木材用のドリルねじでは、鋼板に対する穿孔能力
が低く、ねじ込み作業性が著しく低下してしまう。これ
に対して、鋼板用のドリルねじでは、穿孔能力は十分で
あるものの、軟質材料へのねじ込み時に発生する切り屑
を適切に排出できずに切り屑がねじ谷部に詰まって途中
からねじ込み不能となってしまうことがある。However, if the materials of a plurality of members to be fastened, particularly the hardness and toughness, are greatly different from each other as in the case where wood or a sound absorbing material is fastened to a steel plate, conventional drill screws cannot be used. I can't respond well. For example, in the case of a drill screw for wood, the drilling ability for a steel plate is low, and the workability of screwing is significantly reduced. In contrast, drilling screws for steel plates have sufficient drilling capacity, but the chips generated during screwing into soft materials cannot be properly discharged, and the chips are stuck in the thread valleys and cannot be screwed in midway. It may be.
【0004】本発明は、このような従来技術の問題点を
解消し、硬さや靱性が互いに大きく異なる複数の部材を
相互に締結する際に切り屑が詰まることなく効率良くね
じ込み作業を行うことの可能なドリルねじを提供するこ
とを目的に案出されたものである。さらに、本発明は、
製造を容易にして製造コストの上昇を抑えることがで
き、これに加えて靱性の低い材質のものに生じる割れを
抑えることが可能なようにドリルねじを構成することを
目的としている。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to efficiently perform a screwing operation without chipping when a plurality of members having greatly different hardness and toughness are fastened to each other. It has been devised to provide a possible drill screw. Further, the present invention provides
It is an object of the present invention to configure a drill screw so that manufacturing can be facilitated and an increase in manufacturing cost can be suppressed, and in addition, a crack generated in a material having low toughness can be suppressed.
【0005】[0005]
【課題を解決するための手段】このような目的を果たす
ために、本発明においては、ドリルねじの構成を、ねじ
山に、ドリル部の切削で生じた切り屑が頭部側に通り抜
け可能な切り屑排出用切り欠きが設けられたものとし
た。In order to achieve such an object, in the present invention, a drill screw is formed so that a chip formed by cutting a drill portion can pass through a screw thread toward a head side. A notch for chip discharge was provided.
【0006】これによると、ドリル部の切削で生じた切
り屑が、下孔の内周面と軸体との間を、従来通りねじ山
に沿って螺旋状に頭部側に送られるのに加えて、切り欠
きを通って次の谷部に送られるようになるため、切り屑
が素早く頭部側に送り出され、切り屑の排出能力を高め
ることができる。そして、ドリル部に硬質材に適した切
削能力の高いものを採用することで、硬さや靱性が互い
に大きく異なる部材を相互に締結する際にも、ねじ込み
作業性を低下させずに済む。切り欠きは数多く設けるこ
とで排出能力が高まるが、反面、被締結材に対するねじ
山の引っかかり面積が小さくなり保持力が低下すること
から、要求される条件を満足する限度で適宜設けること
になる。通常、ねじ山のリードあたり一対ずつ設けると
良い。[0006] According to this, the chips generated by the cutting of the drill portion are sent between the inner peripheral surface of the pilot hole and the shaft in a spiral manner along the screw thread toward the head as in the past. In addition, since the chips are sent to the next valley through the notch, the chips are quickly sent out to the head side, and the ability to discharge chips can be increased. By employing a drill having a high cutting ability suitable for a hard material, even when members having significantly different hardnesses and toughnesses are mutually fastened, the screwing workability does not need to be reduced. By providing a large number of cutouts, the discharging capacity is increased, but on the other hand, the area where the thread is caught by the material to be fastened is reduced and the holding force is reduced, so that the cutouts are appropriately provided as long as required conditions are satisfied. Usually, it is good to provide a pair for each thread lead.
【0007】また、切り欠きの形態は、発生する切り屑
の大きさ等を勘案して切り屑が円滑に通り抜け可能なよ
うに被締結材の材質に応じて適宜設定すれば良い。この
とき、ねじ山を深く切り欠くことで切り屑の排出能力が
高まる反面、切り欠きの断面積が増大するのに応じて被
締結材に対する引っかかり面積が減少し、保持力の低下
を招くことになる。そこで、例えば、切り欠きによって
ねじ山の全高に渡るV字谷を形成するようにすれば、切
り屑の排出能力を高めると共に、引っかかり面積の減少
を抑えて保持力を確保することができる。また、切り欠
きをねじ山の頂部側に部分的に設け、平坦な頂面を有す
る台形状部分を形成するようにすると、引っかかり面積
の減少を抑えると共に引っかかり強度をさほど低下させ
ずに済む。Further, the form of the notch may be appropriately set according to the material of the material to be fastened so that the chip can smoothly pass through in consideration of the size of the generated chip and the like. At this time, although the ability to discharge chips is enhanced by notching the screw thread deeply, the area of engagement with the workpiece decreases as the cross-sectional area of the notch increases, leading to a decrease in holding force. Become. Therefore, for example, by forming a V-shaped valley over the entire height of the screw thread by the notch, it is possible to increase the chip discharging ability and suppress the decrease in the catching area to secure the holding force. In addition, if the notch is partially provided on the top side of the screw thread to form a trapezoidal portion having a flat top surface, the reduction in the catching area is suppressed and the catching strength is not significantly reduced.
【0008】特に、切り欠きによりねじ山より一段低い
山形状部分が形成されていると好ましく、これによる
と、山形状部分の斜面がねじ山の斜面より後退している
ため、その分ねじ込み時に下穴の内周面に圧接する面積
が減少し、ねじ込みトルクを低減することができる。し
かも、下穴の内周面に作用する応力を軽減し、木材のよ
うな靱性の低い材質のものに生じる割れを抑えることが
できる。さらに、締結時には、被締結材に対する引っか
かり面積を山形状部分で確保することができ、保持力の
低下を抑えることができる。[0008] In particular, it is preferable that the notch forms a thread-shaped portion one step lower than the screw thread. According to this, the slope of the thread-shaped portion is recessed from the slope of the screw thread, so that the lower portion is screwed down when screwing. The area contacting the inner peripheral surface of the hole is reduced, and the screwing torque can be reduced. In addition, the stress acting on the inner peripheral surface of the prepared hole is reduced, and cracks that occur in a material having low toughness such as wood can be suppressed. Furthermore, at the time of fastening, the area to be caught by the material to be fastened can be secured in the mountain-shaped portion, and a decrease in holding force can be suppressed.
【0009】その上、切り欠きは、ねじ山に概ね直交す
るリード角をもって螺旋状に複数列んで設けられている
と良く、これによると、ねじ部のねじ立てを行うための
転造工具を製作する際に切り欠きに対応した凸部の形成
が容易になり、また転造加工も容易になり、製造コスト
の低減を図ることができる。[0009] In addition, the notches are preferably provided in a plurality of rows spirally with a lead angle substantially perpendicular to the thread. According to this, a rolling tool for threading a thread portion is manufactured. When forming, the projections corresponding to the notches are easily formed, and the rolling process is also facilitated, so that the manufacturing cost can be reduced.
【0010】これに加えて、ねじ山角度が45°〜55
°であると好ましく、これによると、ねじ山角度を60
°に設定した一般的なものに比較して、ねじ山の断面積
が小さくなることから、ねじ込みトルクを低減すると共
に、靱性の低い材質のものに生じる割れを防止すること
ができる。なお、ねじ山角度が45゜を下回ると、ねじ
山の強度不足により保持力が低下し、逆にねじ山角度が
55°を越えると、前記の効果が十分に得られない。[0010] In addition, the thread angle is 45 ° to 55 °.
°, and according to this, the thread angle is 60 °.
Since the cross-sectional area of the screw thread is smaller than that of a general screw set at an angle of °, it is possible to reduce the screwing torque and to prevent cracking of a material having low toughness. If the thread angle is less than 45 °, the holding force is reduced due to insufficient strength of the thread. Conversely, if the thread angle exceeds 55 °, the above effect cannot be obtained sufficiently.
【0011】[0011]
【発明の実施の形態】以下に添付の図面を参照して本発
明の構成を詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings.
【0012】図1は、本発明に基づき構成されたドリル
ねじの第1の実施形態を示している。このドリルねじ
は、ねじ回し工具の係合手段(図示せず)が設けられた
頭部1と、被締結材に下穴を穿設するドリル部2並びに
下穴に対してねじ立てを行うねじ山3が円柱状の軸体4
の周囲に螺旋状に形成されたねじ部5を備えた軸部6と
からなっている。FIG. 1 shows a first embodiment of a drill screw constructed according to the present invention. The drill screw includes a head 1 provided with a screwdriver engagement means (not shown), a drill portion 2 for drilling a pilot hole in a material to be fastened, and a screw for tapping the pilot hole. The mountain 3 is a cylindrical shaft 4
And a shaft portion 6 provided with a screw portion 5 formed in a spiral shape around the shaft portion.
【0013】ドリル部2は、鋼板等の硬質材料への切り
込み能力に優れた切削刃7と、木材等の軟質材料の切削
により発生する比較的大径な切り屑も円滑に排出可能な
ように形成された逃げ溝8とを備えている。The drill 2 has a cutting blade 7 having an excellent ability to cut into hard materials such as a steel plate, and a relatively large-diameter chip generated by cutting a soft material such as wood so that it can be smoothly discharged. And a formed escape groove 8.
【0014】ねじ山3の角度は、45°〜55°に設定
され、ねじ込みトルクを低減すると共に、靱性の低い材
質のものに生じる割れを防止し得るようになっている。
このねじ山3には、ドリル部2の逃げ溝8からの切り屑
を、順次、頭部1側に送り出す複数のV字谷9がねじ山
3の全高に渡って切り欠いて形成されている。The angle of the thread 3 is set in the range of 45 ° to 55 ° so that the screwing torque can be reduced and cracks occurring in a material having low toughness can be prevented.
The thread 3 is formed with a plurality of V-shaped valleys 9 for sequentially sending chips from the clearance groove 8 of the drill portion 2 to the head 1 side by cutting out the entire height of the thread 3. .
【0015】このV字谷9は、ねじ山3に概ね直交する
リード角をもって螺旋状に配置され、この螺旋状に列ん
だV字谷群が、中心軸に対して対称に一対ずつ設けられ
た切削刃7並びに逃げ溝8に対応して2組設けられてい
る。これにより、逃げ溝8からの切り屑が、軸体4と下
孔の内周面との間をねじ山3に沿って頭部1側に送られ
るのに加えて、V字谷9を通って軸方向にも送られるよ
うになり、切り屑を素早く頭部1側に送り出すことがで
きる。The V-shaped valleys 9 are helically arranged with a lead angle substantially perpendicular to the thread 3, and a group of V-shaped valleys arranged in a spiral are provided symmetrically with respect to the central axis. Two sets are provided corresponding to the cutting blades 7 and the relief grooves 8. This allows chips from the escape groove 8 to be sent to the head 1 side along the thread 3 between the shaft body 4 and the inner peripheral surface of the pilot hole, and also to pass through the V-shaped valley 9. The chips can also be sent in the axial direction, and the chips can be quickly sent out to the head 1 side.
【0016】なお、ここでは、螺旋状に列んだ切り欠き
群を2組設けているが、締結時の保持力等の条件が許せ
ば、これより多数設けるようにしても良く、切り屑の排
出能力をより一層高めることができる。Although two sets of spirally arranged notches are provided here, a larger number of notches may be provided if conditions such as holding force at the time of fastening permit. The discharge capacity can be further improved.
【0017】図2は、本発明に基づき構成されたドリル
ねじの第2の実施形態を示している。ここでは、前記第
1の実施形態で示したV字谷9に代わって、ねじ山3の
頂部を部分的に切除する態様で平坦な頂面を有する台形
状部分21が設けられている。FIG. 2 shows a second embodiment of a drill screw constructed according to the present invention. Here, instead of the V-shaped valley 9 shown in the first embodiment, a trapezoidal portion 21 having a flat top surface is provided in such a manner that the top of the thread 3 is partially cut off.
【0018】図3は、本発明に基づき構成されたドリル
ねじの第3の実施形態を示している。ここでは、ねじ山
3の両肩の斜面3aを高さ方向に一様に切除してねじ山
3より一段低い山形状部分31が形成されている。この
山形状部分31は、図4に示すように、その角度θ2が
ねじ山3の角度θ1と同一の45°〜55°に設定さ
れ、ねじ山3と相似な断面形状をなしている。この場
合、山形状部分31の高さh2は、ねじ山3の高さh1の
90%程度とすると良い。FIG. 3 shows a third embodiment of a drill screw constructed according to the present invention. Here, the slopes 3a of both shoulders of the thread 3 are uniformly cut in the height direction to form a thread-shaped portion 31 one step lower than the thread 3. As shown in FIG. 4, the angle θ 2 of the mountain-shaped portion 31 is set to 45 ° to 55 °, which is the same as the angle θ 1 of the thread 3, and has a cross-sectional shape similar to the thread 3. . In this case, the height h 2 of the chevron-shaped portion 31, it is preferable to 90% of the height h 1 of the thread 3.
【0019】この山形状部分31は、図5に示すよう
に、ねじ山3と共通の底辺で、山形状部分31の角度θ
2をねじ山3の角度θ1より大きく設定することで、ねじ
山3より一段低く形成する態様も可能である。この場
合、角度差θ2−θ1を2°〜5°に設定すると良い。As shown in FIG. 5, the crest-shaped portion 31 has an angle θ of the crest-shaped portion 31 at the bottom common to the thread 3.
2 By setting larger than the angle theta 1 of the thread 3, is also possible embodiment be formed one step lower than the thread 3. In this case, it is preferable to set the angle difference θ 2 −θ 1 to 2 ° to 5 °.
【0020】[0020]
【発明の効果】このように本発明によれば、切り屑の排
出能力を高めることができるため、軟質で靱性の乏しい
部材にねじ込む際にも切り屑がねじ山間に詰まることが
なく、ねじ込み作業を円滑に行うことができる。そし
て、ドリル部に硬質材に適した切削能力の高いものを採
用することで、硬さや靱性が互いに大きく異なる部材を
相互に締結する際にも、ねじ込み作業性を低下させずに
済む。As described above, according to the present invention, the ability to discharge chips can be enhanced, so that even when screwing into a soft and poorly tough member, the chips are not clogged between the screw threads, and the screwing operation can be performed. Can be performed smoothly. By employing a drill having a high cutting ability suitable for a hard material, even when members having significantly different hardnesses and toughnesses are mutually fastened, the screwing workability does not need to be reduced.
【0021】特に、切り欠きがねじ山に概ね直交するリ
ード角をもって螺旋状に配置されていると、ねじ部のね
じ立てを行うための転造工具の製作並びに転造加工が容
易になり、製造コストの低減を図ることができる。その
上、切り欠きによりねじ山より一段低い山形状部分を形
成したり、ねじ山角度を45〜55°に設定したりする
ことで、保持力を格別低下させることなく、ねじ込みト
ルクを低減すると共に、木材のような靱性の低い材質の
ものに生じる割れを効果的に抑えることができる。In particular, if the notches are helically arranged with a lead angle substantially perpendicular to the thread, it is easy to manufacture and form a rolling tool for tapping a screw portion, and to manufacture the rolling tool. Cost can be reduced. In addition, by forming a thread-shaped portion one step lower than the screw thread by notch or setting the thread angle to 45 to 55 °, the screwing torque can be reduced without significantly lowering the holding force. Further, cracks generated in a material having low toughness such as wood can be effectively suppressed.
【図1】本発明によるドリルねじの第1の実施形態を示
す斜視図。FIG. 1 is a perspective view showing a first embodiment of a drill screw according to the present invention.
【図2】本発明によるドリルねじの第2の実施形態を示
す要部拡大斜視図。FIG. 2 is an enlarged perspective view of a main part showing a second embodiment of the drill screw according to the present invention.
【図3】本発明によるドリルねじの第3の実施形態を示
す要部拡大斜視図。FIG. 3 is an enlarged perspective view of a main part showing a third embodiment of a drill screw according to the present invention.
【図4】図3に示したドリルねじの要部断面図。FIG. 4 is a sectional view of a main part of the drill screw shown in FIG. 3;
【図5】図3に示したドリルねじの変形例を示す図4と
同様の断面図。FIG. 5 is a sectional view similar to FIG. 4, showing a modified example of the drill screw shown in FIG. 3;
1 頭部 2 ドリル部 3 ねじ山 4 軸体 5 ねじ部 6 軸部 7 切削刃 8 逃げ溝 9 V字谷 21 台形状部分 31 山形状部分 DESCRIPTION OF SYMBOLS 1 Head 2 Drill part 3 Thread 4 Shaft 5 Screw part 6 Shaft part 7 Cutting blade 8 Escape groove 9 V-shaped valley 21 Trapezoid part 31 Peak shape part
Claims (6)
ルねじであって、 前記ねじ軸のねじ山に、前記ドリル部の切削で生じた切
り屑が頭部側に通り抜け可能な切り屑排出用切り欠きを
設けたことを特徴とするドリルねじ。1. A drill screw having a drill portion at a tip of a screw shaft, wherein a chip generated by cutting of the drill portion can pass through a thread of the screw shaft to a head side for chip discharge. A drill screw characterized by having a notch.
に渡るV字谷を形成したことを特徴とする請求項1に記
載のドリルねじ。2. The drill screw according to claim 1, wherein the notch forms a V-shaped valley over the entire height of the screw thread.
部分的に設け、平坦な頂面を有する台形状部分を形成し
たことを特徴とする請求項1に記載のドリルねじ。3. The drill screw according to claim 1, wherein the notch is provided partially on the top side of the screw thread to form a trapezoidal portion having a flat top surface.
段低い山形状部分を形成したことを特徴とする請求項1
に記載のドリルねじ。4. A thread-shaped portion which is one step lower than said screw thread is formed by said notch.
Drill screw according to.
交するリード角をもって螺旋状に複数列べて配置したこ
とを特徴とする請求項1乃至請求項4のいずれかに記載
のドリルねじ。5. The drill screw according to claim 1, wherein the cutouts are spirally arranged in a plurality of rows with a lead angle substantially perpendicular to the screw thread.
ことを特徴とする請求項1乃至請求項5のいずれかに記
載のドリルねじ。6. The drill screw according to claim 1, wherein a thread angle is 45 ° to 55 °.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33154197A JPH11166519A (en) | 1997-12-02 | 1997-12-02 | Drill screw |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33154197A JPH11166519A (en) | 1997-12-02 | 1997-12-02 | Drill screw |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH11166519A true JPH11166519A (en) | 1999-06-22 |
Family
ID=18244824
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP33154197A Pending JPH11166519A (en) | 1997-12-02 | 1997-12-02 | Drill screw |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH11166519A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI648479B (en) * | 2018-01-15 | 2019-01-21 | 甫商有限公司 | Self-drilling screw |
US10767680B2 (en) | 2018-01-15 | 2020-09-08 | Fushang Co., Ltd. | Self-drilling screw |
-
1997
- 1997-12-02 JP JP33154197A patent/JPH11166519A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI648479B (en) * | 2018-01-15 | 2019-01-21 | 甫商有限公司 | Self-drilling screw |
US10767680B2 (en) | 2018-01-15 | 2020-09-08 | Fushang Co., Ltd. | Self-drilling screw |
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